current monitoring 1000V motor

[petersonra]

So a customer asked for a suggestion for current monitoring for a 1000V motor. It normally runs about 1300A. Not exactly a small motor.

So, I went looking. I figure how hard can this be. I do not find anything suitable with insulation rated for 1000V.

All the manufacturers tell me not a problem since the motor wiring provides adequate insulation. I think this makes sense and something I found in the code seems to support that, but I cannot put my finger on just what it said right this second.

What do you guys think about this product? Anyone ever use it?

No need to unhook the motor wires to install the sensor around the conductors.

http://nktechnologies.com/current-transducers/atcr-current-transducers.html

 

[fmtjfw]

NEC references Current Transformers:

110.23 short circuit when not in use
240.15(A) may be used for OCPD
240.92(C)(2)(3) used in Overload Protection
240.100(A)(1) number required
250.170 Exc. 2 secondaries not required to be grounded under some circumstances
250.172 cases grounded except below 150V
250.190 (C)(3) info
450.1 exc 1 CTs not covered in this article
450.5(A)(3) info
490.72(C) use to protect electrode boilers
517.17(B) use in GFPE
708.52(B) use in GFPE


Utility practice for bushing mounted (surrounding) CTs is low-voltage insulation rating.